Repair Boot Disk in Mac OS X with Disk Utility & Recovery HD

If you have tried to repair the boot volume before in Mac OS X before, you’ll undoubtedly have found the “Repair Disk” option is grey and unavailable within the Disk Utility tool.…

Hard drive issues. HD won't reformat or repair permissions

Tech Tip: How to Use the Restore Feature of Disk Utility to Clone a Drive

How to Restore Mac with the help of Recovery HD

A Guide on How to Fix No Startup Disk on Mac

iMac, macbook frozen start up fix

How to Verify & Repair Permissions in OS X El Capitan

How to Verify & Repair Permissions in OS X El Capitan

MacOS Recovery Explained

Macintosh HD vs. Macintosh HD Data: What Are the Differences - EaseUS

Building an OS X Triage Drive - The Instructional

How to restore system files on a Mac when the hard drive is corrupted, without losing any important data - Quora

Is There A chkdsk for Mac - Repair and Format Disk on Mac